[0,2,3,0,5,6,2,6,7,3,7,8,4,8,9,5,9,10,6,10,11,7, 11,12,8,12,13,9,13,14,10,14,15,11,15,16,12,16,17, 13,17,18,14,18,19,15,19,20,16,20,21,17,21,22,18, 22,23,19,23,24,20,24,25,21,25,26,22,26,27,23]